2002-08-22  Michael Natterer  <mitch@gimp.org>

	Fixed usage of uninitialized memory found by valgrind,
	plus some cleanup:

	* app/base/pixel-region.[ch]: allocate PixelRegionIterators and
	PixelRegionHolders with g_new0(). Changed return values of
	pixel_regions_register() and pixel_regions_process() from gpointer
	to PixelRegionIterator*

	* app/base/pixel-processor.c: no need to cast the above return values.

	* app/base/temp-buf.[ch]: initialize PixelRegions with { 0 }
	before using them for TempBufs.

	* app/gui/device-status-dialog.c: initialize colors before
	passing them to gimp_color_area_new().